java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default_PUPT.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/simple4.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d19836b [2018-09-26 21:54:00,382 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-26 21:54:00,384 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-26 21:54:00,396 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-09-26 21:54:00,429 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default_PUPT.epf [2018-09-26 21:54:00,445 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-26 21:54:00,445 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-26 21:54:00,446 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-26 21:54:00,446 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-26 21:54:00,447 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-26 21:54:00,447 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-26 21:54:00,447 INFO L133 SettingsManager]: * Use SBE=true [2018-09-26 21:54:00,447 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-26 21:54:00,448 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-26 21:54:00,448 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-26 21:54:00,448 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-26 21:54:00,448 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-26 21:54:00,448 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-26 21:54:00,448 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-26 21:54:00,449 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-26 21:54:00,449 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-26 21:54:00,449 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-26 21:54:00,449 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-26 21:54:00,449 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-26 21:54:00,450 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-26 21:54:00,450 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-26 21:54:00,450 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-26 21:54:00,450 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-26 21:54:00,450 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-26 21:54:00,451 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-26 21:54:00,451 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-26 21:54:00,451 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-26 21:54:00,451 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-26 21:54:00,451 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-26 21:54:00,451 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-26 21:54:00,452 INFO L133 SettingsManager]: * Use predicate trie based predicate unification=true [2018-09-26 21:54:00,506 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-26 21:54:00,524 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-26 21:54:00,530 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-26 21:54:00,532 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-26 21:54:00,532 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-26 21:54:00,533 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/simple4.i_3.bpl [2018-09-26 21:54:00,533 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/simple4.i_3.bpl' [2018-09-26 21:54:00,593 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-26 21:54:00,597 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-26 21:54:00,598 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-26 21:54:00,598 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-26 21:54:00,598 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-26 21:54:00,621 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,634 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,641 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-26 21:54:00,642 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-26 21:54:00,642 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-26 21:54:00,643 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-26 21:54:00,655 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,655 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,656 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,656 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,661 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,663 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... [2018-09-26 21:54:00,666 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-26 21:54:00,666 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-26 21:54:00,667 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-26 21:54:00,667 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-26 21:54:00,669 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-26 21:54:00,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-26 21:54:00,747 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-26 21:54:00,921 INFO L346 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-26 21:54:00,922 INFO L202 PluginConnector]: Adding new model simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:54:00 BoogieIcfgContainer [2018-09-26 21:54:00,922 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-26 21:54:00,924 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-26 21:54:00,924 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-26 21:54:00,931 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-26 21:54:00,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:54:00" (1/2) ... [2018-09-26 21:54:00,932 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56c559d2 and model type simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.09 09:54:00, skipping insertion in model container [2018-09-26 21:54:00,932 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:54:00" (2/2) ... [2018-09-26 21:54:00,935 INFO L112 eAbstractionObserver]: Analyzing ICFG simple4.i_3.bpl [2018-09-26 21:54:00,949 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-26 21:54:00,961 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-26 21:54:01,010 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-26 21:54:01,011 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-26 21:54:01,011 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-26 21:54:01,012 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-26 21:54:01,012 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-26 21:54:01,012 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-26 21:54:01,012 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-26 21:54:01,013 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-26 21:54:01,013 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-26 21:54:01,026 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-26 21:54:01,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-26 21:54:01,033 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:01,034 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-26 21:54:01,035 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:01,043 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:01,043 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-26 21:54:01,045 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:01,046 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:01,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:01,098 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:54:01,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:01,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:01,226 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:01,228 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-26 21:54:01,228 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-26 21:54:01,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-26 21:54:01,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-26 21:54:01,248 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:01,250 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-26 21:54:01,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:01,360 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-26 21:54:01,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-26 21:54:01,363 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-26 21:54:01,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:01,376 INFO L225 Difference]: With dead ends: 11 [2018-09-26 21:54:01,377 INFO L226 Difference]: Without dead ends: 7 [2018-09-26 21:54:01,381 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:01,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-26 21:54:01,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-26 21:54:01,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-26 21:54:01,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-26 21:54:01,420 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-26 21:54:01,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:01,421 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-26 21:54:01,421 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-26 21:54:01,421 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-26 21:54:01,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-26 21:54:01,422 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:01,422 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-26 21:54:01,422 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:01,422 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:01,423 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-26 21:54:01,423 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:01,423 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:01,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:01,424 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:54:01,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:01,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:01,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:01,554 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:01,554 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:01,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:54:01,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:01,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:01,720 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:01,742 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:01,742 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-26 21:54:01,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-26 21:54:01,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-26 21:54:01,744 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:01,744 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-26 21:54:01,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:01,869 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-26 21:54:01,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-26 21:54:01,871 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-26 21:54:01,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:01,874 INFO L225 Difference]: With dead ends: 11 [2018-09-26 21:54:01,874 INFO L226 Difference]: Without dead ends: 9 [2018-09-26 21:54:01,875 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:01,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-26 21:54:01,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-26 21:54:01,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-26 21:54:01,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-26 21:54:01,882 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-26 21:54:01,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:01,883 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-26 21:54:01,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-26 21:54:01,883 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-26 21:54:01,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-26 21:54:01,884 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:01,884 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-26 21:54:01,885 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:01,885 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:01,885 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-26 21:54:01,886 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:01,886 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:01,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:01,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:54:01,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:01,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:02,024 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:02,025 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:02,025 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:02,039 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:54:02,053 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:54:02,053 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:54:02,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:02,153 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:02,185 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:02,185 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-26 21:54:02,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-26 21:54:02,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-26 21:54:02,186 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:02,186 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-26 21:54:02,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:02,533 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-26 21:54:02,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-26 21:54:02,533 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-26 21:54:02,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:02,534 INFO L225 Difference]: With dead ends: 13 [2018-09-26 21:54:02,534 INFO L226 Difference]: Without dead ends: 11 [2018-09-26 21:54:02,535 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:02,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-26 21:54:02,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-26 21:54:02,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-26 21:54:02,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-26 21:54:02,540 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-26 21:54:02,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:02,540 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-26 21:54:02,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-26 21:54:02,540 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-26 21:54:02,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-26 21:54:02,541 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:02,541 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-26 21:54:02,542 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:02,542 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:02,542 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-26 21:54:02,542 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:02,543 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:02,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:02,544 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:54:02,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:02,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:02,657 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:02,657 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:02,657 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:02,671 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:54:02,683 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-26 21:54:02,684 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:54:02,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:02,780 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:02,801 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:02,802 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-26 21:54:02,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-26 21:54:02,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-26 21:54:02,803 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:02,803 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-26 21:54:03,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:03,134 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-26 21:54:03,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-26 21:54:03,136 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-26 21:54:03,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:03,137 INFO L225 Difference]: With dead ends: 15 [2018-09-26 21:54:03,137 INFO L226 Difference]: Without dead ends: 13 [2018-09-26 21:54:03,137 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:03,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-26 21:54:03,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-26 21:54:03,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-26 21:54:03,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-26 21:54:03,141 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-26 21:54:03,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:03,142 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-26 21:54:03,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-26 21:54:03,142 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-26 21:54:03,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-26 21:54:03,143 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:03,143 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-26 21:54:03,143 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:03,143 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:03,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-26 21:54:03,144 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:03,144 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:03,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:03,145 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:54:03,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:03,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:03,304 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:03,304 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:03,305 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:03,315 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:54:03,324 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:54:03,324 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:54:03,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:03,416 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:03,437 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:03,437 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-26 21:54:03,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-26 21:54:03,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-26 21:54:03,438 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:03,438 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-26 21:54:04,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:04,046 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-26 21:54:04,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-26 21:54:04,047 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-26 21:54:04,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:04,048 INFO L225 Difference]: With dead ends: 17 [2018-09-26 21:54:04,048 INFO L226 Difference]: Without dead ends: 15 [2018-09-26 21:54:04,049 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:04,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-26 21:54:04,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-26 21:54:04,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-26 21:54:04,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-26 21:54:04,053 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-26 21:54:04,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:04,054 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-26 21:54:04,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-26 21:54:04,054 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-26 21:54:04,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-26 21:54:04,055 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:04,055 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-26 21:54:04,055 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:04,056 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:04,056 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-26 21:54:04,056 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:04,056 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:04,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:04,057 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:54:04,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:04,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:04,318 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:04,319 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:04,319 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:04,329 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:54:04,462 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-26 21:54:04,463 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:54:04,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:04,704 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:04,732 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:04,732 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-26 21:54:04,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-26 21:54:04,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-26 21:54:04,733 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:04,733 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-26 21:54:05,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:05,020 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-26 21:54:05,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-26 21:54:05,021 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-26 21:54:05,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:05,022 INFO L225 Difference]: With dead ends: 19 [2018-09-26 21:54:05,022 INFO L226 Difference]: Without dead ends: 17 [2018-09-26 21:54:05,022 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:05,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-26 21:54:05,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-26 21:54:05,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-26 21:54:05,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-26 21:54:05,033 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-26 21:54:05,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:05,034 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-26 21:54:05,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-26 21:54:05,034 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-26 21:54:05,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-26 21:54:05,035 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:05,035 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-26 21:54:05,035 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:05,036 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:05,036 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-26 21:54:05,036 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:05,036 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:05,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:05,037 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:54:05,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:05,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:05,234 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:05,235 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:05,235 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:05,245 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:54:05,270 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-26 21:54:05,270 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:54:05,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:05,377 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:05,402 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:05,402 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-26 21:54:05,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-26 21:54:05,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-26 21:54:05,403 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:05,404 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-26 21:54:05,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:05,689 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-26 21:54:05,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-26 21:54:05,693 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-26 21:54:05,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:05,694 INFO L225 Difference]: With dead ends: 21 [2018-09-26 21:54:05,694 INFO L226 Difference]: Without dead ends: 19 [2018-09-26 21:54:05,694 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:05,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-26 21:54:05,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-26 21:54:05,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-26 21:54:05,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-26 21:54:05,699 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-26 21:54:05,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:05,699 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-26 21:54:05,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-26 21:54:05,699 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-26 21:54:05,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-26 21:54:05,700 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:05,700 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-26 21:54:05,701 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:05,701 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:05,701 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-26 21:54:05,701 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:05,701 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:05,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:05,702 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:54:05,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:05,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:05,940 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:05,941 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:05,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:54:05,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:05,962 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:06,050 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:06,072 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:06,072 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-26 21:54:06,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-26 21:54:06,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-26 21:54:06,073 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:06,074 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-26 21:54:06,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:06,420 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-26 21:54:06,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-26 21:54:06,421 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-26 21:54:06,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:06,422 INFO L225 Difference]: With dead ends: 23 [2018-09-26 21:54:06,422 INFO L226 Difference]: Without dead ends: 21 [2018-09-26 21:54:06,423 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:06,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-26 21:54:06,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-26 21:54:06,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-26 21:54:06,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-26 21:54:06,428 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-26 21:54:06,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:06,428 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-26 21:54:06,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-26 21:54:06,429 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-26 21:54:06,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-26 21:54:06,429 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:06,429 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-26 21:54:06,430 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:06,430 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:06,430 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-26 21:54:06,430 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:06,430 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:06,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:06,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:54:06,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:06,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:06,598 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:06,599 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:06,599 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:06,611 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:54:06,620 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:54:06,620 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:54:06,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:06,797 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:06,819 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:06,819 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-26 21:54:06,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-26 21:54:06,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-26 21:54:06,820 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:06,820 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-26 21:54:07,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:07,233 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-26 21:54:07,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-26 21:54:07,236 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-26 21:54:07,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:07,237 INFO L225 Difference]: With dead ends: 25 [2018-09-26 21:54:07,237 INFO L226 Difference]: Without dead ends: 23 [2018-09-26 21:54:07,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:07,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-26 21:54:07,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-26 21:54:07,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-26 21:54:07,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-26 21:54:07,242 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-26 21:54:07,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:07,242 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-26 21:54:07,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-26 21:54:07,243 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-26 21:54:07,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-26 21:54:07,243 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:07,244 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-26 21:54:07,244 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:07,244 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:07,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-26 21:54:07,244 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:07,244 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:07,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:07,245 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:54:07,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:07,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:07,630 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:07,631 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:07,631 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:07,642 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:54:07,744 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-26 21:54:07,744 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:54:07,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:07,811 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:07,832 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:07,833 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-26 21:54:07,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-26 21:54:07,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-26 21:54:07,833 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:07,834 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-26 21:54:08,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:08,397 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-26 21:54:08,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-26 21:54:08,398 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-26 21:54:08,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:08,399 INFO L225 Difference]: With dead ends: 27 [2018-09-26 21:54:08,399 INFO L226 Difference]: Without dead ends: 25 [2018-09-26 21:54:08,400 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:08,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-26 21:54:08,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-26 21:54:08,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-26 21:54:08,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-26 21:54:08,406 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-26 21:54:08,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:08,406 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-26 21:54:08,406 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-26 21:54:08,406 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-26 21:54:08,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-26 21:54:08,407 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:08,407 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-26 21:54:08,407 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:08,408 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:08,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-26 21:54:08,408 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:08,408 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:08,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:08,409 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:54:08,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:08,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:08,581 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:08,581 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:08,581 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:08,589 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:54:08,621 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:54:08,622 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:54:08,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:54:08,775 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:08,797 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:54:08,797 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-26 21:54:08,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-26 21:54:08,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-26 21:54:08,798 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:54:08,798 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-26 21:54:10,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:54:10,563 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-26 21:54:10,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-26 21:54:10,564 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-26 21:54:10,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:54:10,565 INFO L225 Difference]: With dead ends: 29 [2018-09-26 21:54:10,565 INFO L226 Difference]: Without dead ends: 27 [2018-09-26 21:54:10,566 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:54:10,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-26 21:54:10,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-26 21:54:10,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-26 21:54:10,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-26 21:54:10,571 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-26 21:54:10,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:54:10,572 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-26 21:54:10,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-26 21:54:10,572 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-26 21:54:10,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-26 21:54:10,573 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:54:10,573 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-26 21:54:10,573 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:54:10,573 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:54:10,573 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-26 21:54:10,573 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:54:10,574 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:54:10,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:10,574 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:54:10,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:54:10,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:54:10,783 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:54:10,784 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:54:10,784 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:54:10,792 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:55:38,366 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-26 21:55:38,367 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:55:38,665 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:55:39,306 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:39,349 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:55:39,349 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-26 21:55:39,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-26 21:55:39,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-26 21:55:39,350 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:55:39,350 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-26 21:55:41,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:55:41,258 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-26 21:55:41,260 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-26 21:55:41,260 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-26 21:55:41,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:55:41,261 INFO L225 Difference]: With dead ends: 31 [2018-09-26 21:55:41,261 INFO L226 Difference]: Without dead ends: 29 [2018-09-26 21:55:41,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:55:41,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-26 21:55:41,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-26 21:55:41,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-26 21:55:41,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-26 21:55:41,265 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-26 21:55:41,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:55:41,265 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-26 21:55:41,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-26 21:55:41,266 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-26 21:55:41,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-26 21:55:41,266 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:55:41,267 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-26 21:55:41,267 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:55:41,267 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:55:41,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-26 21:55:41,267 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:55:41,267 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:55:41,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:41,268 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:55:41,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:41,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:55:41,558 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:41,559 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:55:41,559 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:55:41,572 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:55:42,226 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-26 21:55:42,226 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:55:42,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:55:42,383 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:42,404 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:55:42,404 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-26 21:55:42,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-26 21:55:42,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-26 21:55:42,405 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:55:42,405 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-26 21:55:43,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:55:43,275 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-26 21:55:43,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-26 21:55:43,276 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-26 21:55:43,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:55:43,277 INFO L225 Difference]: With dead ends: 33 [2018-09-26 21:55:43,277 INFO L226 Difference]: Without dead ends: 31 [2018-09-26 21:55:43,277 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:55:43,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-26 21:55:43,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-26 21:55:43,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-26 21:55:43,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-26 21:55:43,284 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-26 21:55:43,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:55:43,284 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-26 21:55:43,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-26 21:55:43,284 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-26 21:55:43,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-26 21:55:43,285 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:55:43,285 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-26 21:55:43,286 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:55:43,286 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:55:43,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-26 21:55:43,286 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:55:43,286 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:55:43,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:43,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:55:43,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:43,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:55:43,765 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:43,766 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:55:43,766 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:55:43,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:55:43,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:55:43,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:55:43,992 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:44,012 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:55:44,012 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-26 21:55:44,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-26 21:55:44,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-26 21:55:44,013 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:55:44,013 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-26 21:55:44,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:55:44,983 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-26 21:55:44,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-26 21:55:44,984 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-26 21:55:44,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:55:44,985 INFO L225 Difference]: With dead ends: 35 [2018-09-26 21:55:44,985 INFO L226 Difference]: Without dead ends: 33 [2018-09-26 21:55:44,986 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:55:44,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-26 21:55:44,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-26 21:55:44,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-26 21:55:44,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-26 21:55:44,991 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-26 21:55:44,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:55:44,991 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-26 21:55:44,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-26 21:55:44,992 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-26 21:55:44,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-26 21:55:44,992 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:55:44,993 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-26 21:55:44,993 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:55:44,993 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:55:44,993 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-26 21:55:44,993 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:55:44,993 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:55:44,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:44,994 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:55:44,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:45,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:55:45,406 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:45,407 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:55:45,407 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:55:45,418 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:55:45,431 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:55:45,431 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:55:45,433 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:55:46,058 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:46,079 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:55:46,079 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-26 21:55:46,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-26 21:55:46,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-26 21:55:46,080 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:55:46,080 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-26 21:55:47,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:55:47,175 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-26 21:55:47,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-26 21:55:47,176 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-26 21:55:47,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:55:47,177 INFO L225 Difference]: With dead ends: 37 [2018-09-26 21:55:47,177 INFO L226 Difference]: Without dead ends: 35 [2018-09-26 21:55:47,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:55:47,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-26 21:55:47,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-26 21:55:47,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-26 21:55:47,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-26 21:55:47,183 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-26 21:55:47,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:55:47,183 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-26 21:55:47,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-26 21:55:47,183 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-26 21:55:47,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-26 21:55:47,184 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:55:47,184 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-26 21:55:47,184 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:55:47,184 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:55:47,185 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-26 21:55:47,185 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:55:47,185 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:55:47,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:47,186 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:55:47,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:47,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:55:47,469 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:47,470 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:55:47,470 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:55:47,478 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:55:48,638 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-26 21:55:48,638 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:55:48,656 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:55:48,746 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:48,767 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:55:48,767 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-26 21:55:48,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-26 21:55:48,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-26 21:55:48,768 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:55:48,768 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-26 21:55:49,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:55:49,908 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-26 21:55:49,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-26 21:55:49,911 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-26 21:55:49,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:55:49,912 INFO L225 Difference]: With dead ends: 39 [2018-09-26 21:55:49,912 INFO L226 Difference]: Without dead ends: 37 [2018-09-26 21:55:49,912 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:55:49,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-26 21:55:49,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-26 21:55:49,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-26 21:55:49,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-26 21:55:49,917 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-26 21:55:49,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:55:49,918 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-26 21:55:49,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-26 21:55:49,918 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-26 21:55:49,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-26 21:55:49,919 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:55:49,919 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-26 21:55:49,919 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:55:49,919 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:55:49,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-26 21:55:49,919 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:55:49,919 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:55:49,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:49,920 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:55:49,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:49,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:55:50,363 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:50,364 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:55:50,364 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:55:50,371 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:55:50,385 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:55:50,385 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:55:50,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:55:50,467 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:50,487 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:55:50,488 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-26 21:55:50,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-26 21:55:50,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-26 21:55:50,488 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:55:50,488 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-26 21:55:51,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:55:51,583 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-26 21:55:51,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-26 21:55:51,589 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-26 21:55:51,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:55:51,590 INFO L225 Difference]: With dead ends: 41 [2018-09-26 21:55:51,590 INFO L226 Difference]: Without dead ends: 39 [2018-09-26 21:55:51,591 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:55:51,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-26 21:55:51,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-26 21:55:51,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-26 21:55:51,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-26 21:55:51,597 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-26 21:55:51,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:55:51,600 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-26 21:55:51,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-26 21:55:51,601 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-26 21:55:51,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-26 21:55:51,601 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:55:51,601 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-26 21:55:51,602 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:55:51,602 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:55:51,602 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-26 21:55:51,602 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:55:51,602 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:55:51,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:51,603 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:55:51,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:51,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:55:52,124 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:52,125 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:55:52,125 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:55:52,132 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown